Indirect lighting fixture



Feb. 16,1932. E. F. GUTH INDIRECT LIGHTING FIXTURE Filed March 29, 1930 FIG. 2

ATTORNEY Patented, Feb. 16, 1932 UNITED STATES EDWIN r. GUTH, or WEBSTER GROVES, MISS U I INDIRECT LIGHTING FIXTURE Application filed March 29, 1930. Serial No. 439,906.

My invention relates to that type of fixture termed indirect, and has for its object, to provide a construction which will materially increase the efficiency of the unit from an illuminating standpoint.

A further object is, to provide a supplementary reflector which can be lifted out, washed and replaced in the fixture, in a fraction of the time required to clean the reflec- N tors of the present types of indirect lighting fixtures, without in the least disturbing the supporting means.

Another object is, to so construct the supplementary reflector as to minimize the loss due to absorption of the lumens by the accumulation of dust on the reflecting surface.

A concrete embodiment of my invention is illustrated in the accompanying drawings, which are to be considered as a part of this specification, in which i Fig. 1 is aside section of a fixture constructed in accordance with my invention; and

Figs. 2 and 3 are modified forms.

Similar reference numerals refer to similar parts throughout the entire description.

As shown in the drawings, the fixture is suspended from a canopy 1 by means of a tube 2, to which is secured a socket 3, of the type shown in my United States Letters Patent No. 1.745.691, issued February 4, 1930. In this socket 3 is mounted an electric lamp bulb l. of the so-called gas-filled type. A

holder 5 is screwed on to thethreads 6 formed on the exterior of the socket 3. A plurality of arms 7, detachably secured to the holder 5, terminate in hooks 8, which engage the rim of a bowl 9, preferably formed of metal, although obviously any suitable opaque material may be used.

lVithin this bowl 9 is located my improved supplementary reflector, which comprises a relatively small porcelain bowl 10. Preferably 1 form this bowl 10 of porcelain, for I attain a very high degree of eiiiciency by its use as a reflector, and am able to use a comparatively small reflector, since it (porcelain) can be placed very close to the light source without impairing its efliciency, whereas silvered glass in a similar location would rapidly deteriorate; Although I prefer the use of porcelain, it is obvious that any efiicient reflecting material can be used which will not be spoiled by immediate proximity to heat.

Preferably the interior walls of the bowl 1O slant inwardly and downwardly, which, coupled with the smallness of bowl 10, lessens the surface exposed to dusty and offers little or no lodging for dust which would absorb light and render the fixture less efficient. As a result, any dust will settle down into the bottom point 11, where it will not materially affect efliciency in regular service.

It may be found desirable in some cases to provide knobs 12 on the bottom of the reflecting bowl 10, to space it from the surface 13 of the metal bowl 9, thus providing for a circulation of air through a small hole 14: formed in the bottom of the reflecting bowl 10. The heat of the lamp 4 produces a ourrent of air which, entering this hole 14, passes upwardly, carrying ofl any dust which might have settled on the sides of the porcelain reflector 10. Even if the supplementary reflector 10 were not serviced for as long a period as six months, there would be no appreciable drop in eiilciency where this construction is employed.

The supplementary reflector 10 may be held in place by acenter punch-mark 15 in the bowl 9, to enter a recess 16 in the reflectinn; bowl 10.

It will be apparent that the threads 6 provide means for regulating the position of the filament of the lamp 4 so as to secure any desired spread of illumination.

Having described my invention, what I regard as new, and desire to obtain by Letters Patent of the United States, is:

1. In an indirect lighting fixture, the combination, with a bowl of opaque material, of means to'support said bowl in an upright position, a light source, a reflector formed of porcelain resting within the bowl and below the light source, and means to adjust the position vertically of said light source with relation to the reflector.

2. In an indirect lighting fixture, the combination, with a'bowl of opaque material, of

means to support said bowl in an upright position, a light source, a reflector resting within the bowl and below the light source, and means to adjust the position vertically of said light source with relation to the refiector.

3. In an indirect lighting fixture, the combination, with a bowl of opaque material, of means to support said bowl in an upright position, a light source, a reflector resting within the bowl and below the light source, cooperating means between the bowl and reflector for determining the position of the reflector in the bowl, and means to adjust the position vertically of said light source with nelation to the reflector.

EDWIN F. GUTH. 

